Appendix B: Modbus Address Notation – AutomationDirect Devices
B-5
Stride MQTT Gateway User Manual, 1st Edition
Do-more PLCs
Reading Coils (Function Code 1)
Function Code MQTT Gateway Modbus Address
Data Format
Do-more! Address
1
0
1 bit
MC1
1
1
MC2
1
65534
MC65535
Reading Input Bits (Function Code 2)
Function Code MQTT Gateway Modbus Address
Data Format
Do-more! Address
2
0
1 bit
MI1
2
1
MI2
2
65534
MI65535
Reading Input Registers (Function Code 4)
Function Code MQTT Gateway Modbus Address
Data Format
Do-more! Address*
4
0
16 bit (INT) or
1 bit
MIR1
4
1
MIR2
4
65534
MIR65535
4
0
32 bit (INT)
-
4
1/2
MIR2:D
4
65533/65534
MIR65534:D
4
0
32 bit (FP)
-
4
1
MIR2:RD
4
65533/65534
MIR65534:RD
* Double integers (32 bit) can only be used on even number addresses in Do-more! (MIR2, MIR4, etc…).
Reading Holding Registers (Function Code 3)
Function Code MQTT Gateway Modbus Address
Data Format
Do-more! Address*
3
0
16 bit (INT) or
1 bit
MHR1
3
1
MHR2
3
65534
MHR65535
3
0
32 bit (INT)
-
3
1/2
MHR2:D
3
65533/65534
MHR65534:D
3
0
32 bit (FP)
-
3
1/2
MHR2:RD
3
65533/65534
MHR65534:RD
* Double integers (32 bit) can only be used on even number addresses in Do-more! (MIR2, MIR4, etc…).
